DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 252011
SWODY3
SPC AC 252009

DAY 3 CONVECTIVE OUTLOOK AMEND 1
NWS STORM PREDICTION CENTER NORMAN OK
0309 PM CDT TUE SEP 25 2012

VALID 271200Z - 281200Z

AMENDED TO ADD FCST GEN TSTM LINES FOR SOFTWARE/COMMS CHECK

--- UPDATE ---
GEN TSTM LINES ARE BEING ADDED TO EXISTING OUTLOOK IN ORDER TO CHECK
SYSTEMS IN ADVANCE OF OPERATIONAL DAY-3 TSTM OUTLOOKS THAT BEGIN
TONIGHT. NO CHANGE IS MADE ATTM TO SVR PROBABILITIES OR PREVIOUS
REASONING...WHICH FOLLOWS.

...SYNOPSIS...
A WEAK UPPER FLOW FIELD WILL PERSIST ACROSS THE MAJORITY OF THE U.S.
THIS PERIOD...WITH SLIGHTLY FASTER FLOW ALOFT CONFINED TO THE
NORTHEAST ON THE SRN FRINGE OF ERN CANADA TROUGHING.

A WEAKENING/NEARLY STATIONARY SURFACE FRONT EXTENDING FROM THE
CAROLINAS WWD ACROSS OK WILL CONTINUE TO SUPPORT A ZONE OF SHOWERS
AND SCATTERED THUNDERSTORMS -- PARTICULARLY ACROSS THE KS/NRN OK
REGION AND INTO THE FRONT RANGE WITHIN ZONE OF WARM ADVECTION TO THE
COOL SIDE OF THE SURFACE FRONT. HOWEVER...EXPECT INSTABILITY TO
REMAIN INSUFFICIENT TO SUPPORT APPRECIABLE SEVERE THREAT HERE -- AND
ACROSS THE REMAINDER OF THE FRONTAL ZONE.

..EDWARDS.. 09/25/2012

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